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Why does the default ExtJs time field validation fails with other locale (Chinese)?

I use the zh_CN locale in ExtJs (ExtJs 4.0), the default locale files that ship with ExtJs (no modifications made to it). When I use a timefield in my form, I get a validation error for any value by default. Only if I use the English AM/PM, or if I remove the ??/?? manually at the end, it works ok. I would assume ExtJs would be smart enough to handle the different locales correctly. Do I really need to define my own Regex, MaskRe here? Or how to solve this otherwise? Thanks! I'm fairly new to ExtJs.